After the Yahi were massacred in the mid-nineteenth century, Ishi survived alone for decades in the mountains of northern California, wearing skins and hunting with bow and arrow. His capture in 1911 made him a national sensation; anthropologist Alfred Kroeber declared him the world's most "uncivilized" man and made Ishi a living exhibit in his museum. Thousands came to see the displaced Indian before his death, of tuberculosis. Ishi's Brain follows...